So I found out a way. I am planning to first
> establish a LAN for these three computers and then connect the Line
> (RJ45) from ISP to the same HUB used connect my LAN. Will this work ?

Yes, this should work... 

> My ISP provides IP through DHCP; NOW the issue is how all the three
> machines will get different IP's (Oops I forgot its DHCP).

Give your MAC addresses to your ISP team. They will set it right for you in DHCP.

> Can ISP
> restrict the number of PC I put on to the network from a single
> connection ?

Yes they can ofcourse restrict the number of IP's a client can use at their end using 
a properly configured firewall.

> Will I get reasonable speed using this topology? 

If ISP connection is to a server at ur end and and all ur internal machine is going 
via ur server then ur onto a shared bandwidth, ur ISP may be providing bandwidth for 
one machine only. Else if you are getting IP's for all ur internal machine from ur ISP 
most probably u'll be under a shared bandwidth. Request ur ISP to increase the 
banwidth on per IP basis assigned at ur end. Usaully we are acheiving this task using 
CBQ.

>Also, I
> want to know what crossover connection is and when it is required in a
> network.

There are totally 8 points or pins or lines (I don't know how to define that :( ) for 
data transmission between devices. Among them , in sequence pins 1,2,3,6 are need for 
data transmission. Two for transmission and two for reception.
When two devices are to be connected (eg: machine to machine or Hub to Hub or Hub to 
switch etc:), the transmitted data from Device-1 shld reach the reception point of 
Device-2. So in the case of connecting 2 machines directly, where the connecting point 
is a Ethernet Card, the transmission and reception are set in the same way at both 
sides. At that time if we are using a straight thru cable, transmission data will 
reach the transmission point at the other end, instead if we are using a crossover 
cable (For a crossover cable, one end will be crimped normally and the other end will 
be crimped reverse, Tx will come to Rx and vice versa) transmitted data will end up at 
the reception point at the ethernet card and the link is established. There are Hubs 
with uplink port and without uplink port. For hubs without uplink port, if we want to 
cascade the same with a switch, we need to use a crossover cable, else connect a 
straight thru cable to uplink port of the Hub and connect it to the switch. I doubt if 
I've cleared ur doubt properly. Get to do some practicals with the same things, surely 
u'll come up with good results...

> 
> I believe some serious networking help is required at my end.
> 
> Regards and thanks
> 
> Raghvendra

NB: (Take care of necessary security. Better have a router in place between ur ISP 
connection and ur local Lan) 

regards

Vinu Chandran



> 
> Vinu Chandran wrote in reply to [LIH] LAN Configuration for internet
> connectivity query from Raghvendra 
> 
> >     In ur case the best and easiest way is to get IP's for all your
> >machine from the ISP to whom u r connected. U can request to your cable
> >modem service provider to give u IP's for all the internal machines.
> >Connect the cable modem directly to the Hub (check for uplink port at
> the >Hub for straight thru connection, else use cross over). Inturn
> connect all >the machines to the same hub. If your ISP provides DHCP,
> then conf. all ur >machines to dhcp otherwise take the IP's, DNS entries
> and default gateway >ip from ISP and conf. the same in ur systems. 
> 
> >Usually Cable modem ISP's won't be having problem giving u extra IP's,
> why >I know is I'm working for a Cable modem ISP. :). We used to provide
> IP's as >the customer needs.
> 
> >regards
> 
> >Vinu Chandran
> 
> > On Fri, 6 Sep 2002 18:42:29 +0530
> > "Raghvendra Bali" <[EMAIL PROTECTED]> wrote:
> > 
> > > Hi Guys,
> > > 
> > > I have a cable internet connection. The ISP provides an Ethernet
> card
> > > and connectivity through DNS to the clients.
> > > I have three PCs in different rooms. To provide internet
> connectivity to
> > > all the PCs What I can do is to setup my own LAN, using another
> Ethernet
> > > card and a hub, connecting these 3 PCs and setting up a proxy or DNS
> in
> > > the main PC with cable internet connection. In this case I have to
> keep
> > > the main PC switched on all the time to ensure internet connectivity
> to
> > > all the PCs.
> > > 
> > > (Q)-> Is there a way to achieve this task without having a need to
> keep
> > > the       main PC switched on all the time ?
> > >   i.e. What can be a alternate LAN configuration
> > > 
> > > I hope my problem gets solved.
> > > 
> > > Regards,
> > > Raghvendra
> > > 
> > > -[My Contact Info]-----
> > >  Raghvendra Bali 
> > >  Netmates Infosystems
> > >  http://www.balifamily.net
> > >  [EMAIL PROTECTED]
> > >  Tel:91.522.340279[IN]
> > >  Fax:1.586.314.7060[US]
> 
> 
> 
> 
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